fixup! Add command line switches for memory optimization patches recently merged.

fixup! Add command line switches for memory optimization patches recently merged.

Patch disables "--grow-semi-space-by-n-pages" and
"--custom-semi-space-growth=0" switches from V8's js-flags.
It seems to introduce performance regression in sunspider 1.0.2 test.

Note that [1] only enables the switch. Feature itself was worked on in [2].

[1] http://165.213.202.130/gerrit/#/c/83144/
[2] http://165.213.202.130/gerrit/#/c/81306/
Reviewed by: Antonio Gomes, kavitha devara

Change-Id: Ic827b59966b5d505223431d84e387e7a8390d9f4
Signed-off-by: Pawel Forysiuk <p.forysiuk@samsung.com>